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12 With a very conservative tune up, we made a partial dyno pull on our 383 from 3,500 to 5,500 rpm. At 360 horsepower we beat the 330 horsepower that the factory claimed, but we're sure there's more in this engine. Be sure to follow future issues of Mopar Muscle as we tune our 383 dyno mule and then use it to test a variety of parts. Log onto www.moparmusclemagazine.com to see videos of our dyno pulls.